1)   MegaPipe .Net Compact Framework Control 2.0
MegaPipe .Net Compact Framework Class Library is a reliable and powerful 100% managed code component for handling serial communication and file-transfer (XModem Checksum, XModem CRC, XModem 1K, YModem, YModem-G, ZModem and Kermit).
serial communication, XModem/YModem/ZModem/Kermit .Net Compact Framework Class Library,